[Rev.]; "This edition ... is largely based on an earlier edition written by the L.A. Weaver Co. of Raleigh, N.C."--P. [2] of cover.; "Revised 5/09"--P. [2] of cover.; Includes bibliographical references (p. 27).

[Rev.]; "Revised 8/09"--P. [2] of cover.; "This edition of A guide to the OSHA excavation standard has been updated to include material as prepared by the Construction Education and Research Institute, Department of Civil Engineering at N.C. State...